package com.ranqianhui.randyojcodesandbox;

import cn.hutool.core.util.ArrayUtil;
import com.github.dockerjava.api.DockerClient;
import com.github.dockerjava.api.async.ResultCallback;
import com.github.dockerjava.api.command.*;
import com.github.dockerjava.api.model.*;
import com.github.dockerjava.core.DockerClientBuilder;
import com.github.dockerjava.core.command.ExecStartResultCallback;
import com.ranqianhui.randyojcodesandbox.model.ExecuteCodeRequest;
import com.ranqianhui.randyojcodesandbox.model.ExecuteCodeResponse;
import com.ranqianhui.randyojcodesandbox.model.ExecuteMessage;
import org.springframework.stereotype.Component;
import org.springframework.util.StopWatch;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * docker沙箱的实现
 */
@Component
public class JavaDockerCodeSandbox extends JavaCodeSandboxTemplate {
    private static final boolean FIRST_INIT=false;
    private static final StopWatch stopWatch=new StopWatch();
    @Override
    public List<ExecuteMessage> runFile(File compileFile, List<String> inputList) {
        DockerClient dockerClient= DockerClientBuilder.getInstance().build();
        String image="openjdk:8-alpine";
        if (FIRST_INIT){
            PullImageCmd pullImageCmd = dockerClient.pullImageCmd(image);
            PullImageResultCallback pullImageResultCallback=new PullImageResultCallback(){
                @Override
                public void onNext(PullResponseItem item) {
                    System.out.println("下载镜像："+item.getStatus());
                    super.onNext(item);
                }
            };
            try {
                pullImageCmd.exec(pullImageResultCallback).awaitCompletion();
            } catch (InterruptedException e) {
                System.out.println("拉取镜像异常");
                throw new RuntimeException(e);
            }
        }
        System.out.println("下载完成");
        //创建容器，把编译好的文件同步到容器，挂数据卷
        CreateContainerCmd containerCmd = dockerClient.createContainerCmd(image);
        HostConfig hostConfig=new HostConfig();
        hostConfig.withMemory(100*1000*1000L);//创建容器的时候指定可用内存，这样就解决了内存资源
        hostConfig.withMemorySwap(0L);
        hostConfig.withCpuCount(1L);
        hostConfig.withSecurityOpts(Arrays.asList("seccomp=安全管理配置字符串"));//去网上搜安全管理的字符串
        hostConfig.setBinds(new Bind(compileFile.getParentFile().getAbsolutePath(),new Volume("/app")));//创建容器时，指定一个文件路径映射，就是把编译好的代码文件同步到容器内，让容器能访问执行
        CreateContainerResponse createContainerResponse = containerCmd
                .withNetworkDisabled(true)//设置网络配置为关闭
                .withHostConfig(hostConfig)
                .withAttachStdin(true)
                .withAttachStderr(true)
                .withAttachStdout(true)
                .withTty(true)//双向交互的容器
                .exec();
        System.out.println(createContainerResponse);
        String containerId=createContainerResponse.getId();
        //启动容器,这是一个异步的操作,执行代码
        dockerClient.startContainerCmd(containerId).exec();

        //docker exec beautiful_dijkstra java -cp /app Main 1 3
        //执行命令，并获取输出结果
        List<ExecuteMessage> executeMessageList = new ArrayList<>();
        for (String inoutAgrs : inputList) {
            String[] strings =inoutAgrs.split(" ");
            String[] cmdArray= ArrayUtil.append(new String[] {"java","-cp","/app","Main"},strings);
            ExecCreateCmdResponse execCreateCmdResponse = dockerClient.execCreateCmd(containerId)
                    .withCmd(cmdArray)
                    .withAttachStdin(true)
                    .withAttachStderr(true)
                    .withAttachStdout(true)
                    .exec();
            System.out.println("创建执行命令："+execCreateCmdResponse);
            final String[] message = {null};
            final String[] errorMessage = {null};
            long time=0;
            final boolean[] timeout = {true};
            ExecuteMessage executeMessage=new ExecuteMessage();
            String execId=execCreateCmdResponse.getId();
            ExecStartResultCallback execStartResultCallback=new ExecStartResultCallback(){
                @Override
                public void onComplete() {
                    //如果执行完成，则代表没有超时
                    timeout[0] =false;
                    super.onComplete();
                }

                @Override
                public void onNext(Frame frame) {
                    StreamType streamType = frame.getStreamType();
                    if (StreamType.STDERR.equals(streamType)){
                        errorMessage[0] =new String(frame.getPayload());
                        System.out.println("输出错误结果："+ errorMessage[0]);
                    }else {
                        message[0] =new String(frame.getPayload());
                        System.out.println("输出结果："+ message[0]);
                    }
                    super.onNext(frame);
                }
            };
            final long[] maxMemory = {0L};
            //获取占用内存
            StatsCmd statsCmd = dockerClient.statsCmd(containerId);
            ResultCallback<Statistics> statisticsResultCallback = statsCmd.exec(new ResultCallback<Statistics>() {
                @Override
                public void onNext(Statistics statistics) {
                    System.out.println("内存占用" + statistics.getMemoryStats().getUsage());
                    maxMemory[0] =Math.max(statistics.getMemoryStats().getUsage(), maxMemory[0]);
                }

                @Override
                public void onStart(Closeable closeable) {
                }

                @Override
                public void onError(Throwable throwable) {
                }

                @Override
                public void onComplete() {
                }

                @Override
                public void close() throws IOException {
                }
            });
            statsCmd.exec(statisticsResultCallback);

            try {
                stopWatch.start();
                dockerClient.execStartCmd(execId)
                        .exec(execStartResultCallback)
                        .awaitCompletion(TIME_OUT,TimeUnit.MICROSECONDS);//超时与否都会往下执行
                stopWatch.stop();
                time=stopWatch.getLastTaskTimeMillis();
            } catch (InterruptedException e) {
                System.out.println("程序执行异常");
                throw new RuntimeException(e);
            }
            statsCmd.close();
            executeMessage.setMessage(message[0]);
            executeMessage.setErrorMessage(errorMessage[0]);
            executeMessage.setTime(time);
            executeMessage.setMemory(maxMemory[0]);
            executeMessageList.add(executeMessage);
        }
        return executeMessageList;
    }

    @Override
    public ExecuteCodeResponse executeCode(ExecuteCodeRequest executeCodeRequest) {
        return super.executeCode(executeCodeRequest);
    }
}
